Conversation & Message

data class Conversation(
    val id: String,
    val title: String?,
    val createdAt: Long,
    val updatedAt: Long,
    val userId: String?,
    val status: ConversationStatus
)

enum class ConversationStatus {
    ONGOING,     // serialized as "ongoing" — active conversation
    ENDED,       // serialized as "ended" — conversation has ended
    TAKEN_OVER   // serialized as "taken_over" — conversation taken over by a human agent
}

data class Message(
    val id: String,
    val role: Role,
    val parts: List<Part>,
    val createdAt: Long?,
    val feedback: Feedback?,
    val metadata: MessageMetadata?
)

enum class Feedback {
    POSITIVE,  // serialized as "positive"
    NEGATIVE   // serialized as "negative"
}

data class Page<T>(
    val data: List<T>,
    val cursor: String?,
    val hasMore: Boolean,
    val total: Int
)

val canLoadMore: Boolean

suspend fun loadMore(): Page<T>?